def _sequence(*parsers):
'''same as 'sequence', but less efficient (due to having to
ALWAYS go over all 'parsers'.
'''
def flatten(tree):
try:
return tree if len(tree) != 2 else flatten(tree[0]) + [tree[1]]
except TypeError:
return tree
return syntax_tree(flatten)(reduce(and_, parsers, mzero))
def _sequence(*parsers):
'''same as 'sequence', but less efficient (due to having to
ALWAYS go over all 'parsers'.
'''
def flatten(tree):
try:
return tree if len(tree) != 2 else flatten(tree[0]) + [tree[1]]
except TypeError:
return tree
return syntax_tree(flatten)(reduce(and_, parsers, mzero))
def string(s):
'''Parses a string 's'. Returns it. '''
return syntax_tree(mkString)(sequence(*map(char, s)))
'''
return choice(*map(char, chars))
def noneOf(chars):
'''Succeeds if the current character is NOT in 'chars'. Returns
the parsed character.
'''
return satisfy(lambda ch: ch not in chars,
errorMsg=FOUND_MESSAGE,
noneof=chars)
toString = syntax_tree(mkString)
isUpper = lambda ch: ch >= 'A' and ch <= 'Z'
isLower = lambda ch: ch >= 'a' and ch <= 'z'
isDigit = lambda ch: ch >= '0' and ch <= '9'
DIGITS = ''.join(map(str, xrange(10)))
anyChar = satisfy(lambda _: True)
upper = satisfy(isUpper, errorMsg=UNEXPECTED_MESSAGE, expected=ascii_uppercase)
lower = satisfy(isLower, errorMsg=UNEXPECTED_MESSAGE, expected=ascii_lowercase)
letter = lower | upper
letters = toString(many1(letter))
digit = satisfy(isDigit, errorMsg=UNEXPECTED_MESSAGE, expected=DIGITS)
def string(s):
'''Parses a string 's'. Returns it. '''
return syntax_tree(mkString)(sequence(*map(char, s)))
def noneOf(chars):
'''Succeeds if the current character is NOT in 'chars'. Returns
the parsed character.
'''
return satisfy(lambda ch: ch not in chars,
errorMsg=FOUND_MESSAGE,
noneof=chars)
toString = syntax_tree(mkString)
isUpper = lambda ch: ch >= 'A' and ch <= 'Z'
isLower = lambda ch: ch >= 'a' and ch <= 'z'
isDigit = lambda ch: ch >= '0' and ch <= '9'
DIGITS = ''.join(map(str, xrange(10)))
anyChar = satisfy(lambda _: True)
upper = satisfy(isUpper,
errorMsg=UNEXPECTED_MESSAGE,
expected=ascii_uppercase)
lower = satisfy(isLower,
errorMsg=UNEXPECTED_MESSAGE,
expected=ascii_lowercase)
